Title :
A novel absorption band-pass filter with compact structure and wide relative bandwidth
Author :
Wei-wei Qin ; An-gang Shu
Author_Institution :
State Key Lab. of Electron. Thin Films & Integrated Devices, Univ. of Electron. Since & Technol. of China, Chengdu, China
Abstract :
A novel absorption band-pass filter (ABF) with wide relative bandwidth and compact structure is proposed and investigated. The ABF consists of two identical 3dB directional coupler (DTC) and two identical reflecting band-pass filters (RBF), which are all based on Microstrip line structure. Firstly, Compared with conventional LC filter, this novel filter has higher passband frequency, broader relative bandwidth and 3dB bandwidth, due to the application of Microstrip line structure. Secondly, the structure of the device is compact and designed simply, it has low cost and can be easily integrated with the active devices. Finally, we get a novel ABF with good performance: the center frequency is 4GHz, the 3dB bandwidth of the ABF is 745MHz, the insertion loss in passband is less than 3dB, the voltage standing wave ratio (VSWR) is less than 1.7 in passband, the relative bandwidth is 18.625%.
Keywords :
active filters; band-pass filters; directional couplers; microstrip lines; microwave filters; ABF; DTC; LC filter; RBF; VSWR; absorption band-pass filter; active devices; bandwidth 745 MHz; compact structure; directional coupler; frequency 4 GHz; microstrip line structure; passband frequency; reflecting band-pass filters; relative bandwidth; voltage standing wave ratio; Absorption; Band-pass filters; Bandwidth; Microwave circuits; Microwave communication; Microwave filters; Passband; 3dB directional coupler; absorption band-pass filter; combline band-pass filter; microstrip line; reflecting filter;
Conference_Titel :
Electronic Packaging Technology (ICEPT), 2014 15th International Conference on
Conference_Location :
Chengdu
DOI :
10.1109/ICEPT.2014.6922875
